You don't.. you have to look at places like boxtorrent and #xbins. Xport don't distribute the emulators directly because of legal issues over the bios and copyright used. I can't even link you to download sites for them for the very same reasons. Google the name of the emulator, or even easier just install them off an installer disk.
muchos gracies.... i was able to find them by those means. I kinda figured it was something like that.